Figure 5a. Phantom images demonstrate the effect of DFT size. Both images were acquired with identical imaging parameters (256 x 256 acquisition matrix, 20-cm FOV, 0.78-mm nominal resolution). (a) Reconstruction with a 256 x 256 DFT. (b) Reconstruction with a 512 x 512 DFT and zero filling. The zero-filled reconstruction is a better representation of the acquired resolution than is the 256 x 256 DFT.